<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2015/6/26
 * Time: 13:36
 */

namespace common\models;
class Page{

    private $each_disNums;//每页显示的条目数
    private $nums;//总条目数
    private $current_page;//当前被选中的页
    private $sub_pages;//每次显示的页数
    private $pageNums;//总页数
    private $page_array = array();//用来构造分页的数组
    private $subPage_link;//每个分页的链接
    private $subPage_type;//显示分页的类型
    /*
    __construct是SubPages的构造函数，用来在创建类的时候自动运行.
    @$each_disNums   每页显示的条目数
    @nums     总条目数
    @current_num     当前被选中的页
    @sub_pages       每次显示的页数
    @subPage_link    每个分页的链接
    @subPage_type    显示分页的类型

    当@subPage_type=1的时候为普通分页模式
          example：   共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
          当@subPage_type=2的时候为经典分页样式
          example：   当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
    */
    function __construct($each_disNums,$nums,$current_page,$sub_pages,$subPage_link,$subPage_type){
        $this->each_disNums=intval($each_disNums);
        $this->nums=intval($nums);
        if(!$current_page){
            $this->current_page=1;
        }else{
            $this->current_page=intval($current_page);
        }
        $this->sub_pages=intval($sub_pages);
        $this->pageNums=ceil($nums/$each_disNums);
        $this->subPage_link=$subPage_link;
        $this->show_SubPages($subPage_type);
        //echo $this->pageNums."--".$this->sub_pages;
    }


    /*
        __destruct析构函数，当类不在使用的时候调用，该函数用来释放资源。
       */
    function __destruct(){
        unset($each_disNums);
        unset($nums);
        unset($current_page);
        unset($sub_pages);
        unset($pageNums);
        unset($page_array);
        unset($subPage_link);
        unset($subPage_type);
    }

    /*
        show_SubPages函数用在构造函数里面。而且用来判断显示什么样子的分页
       */
    function show_SubPages($subPage_type){
        if($subPage_type == 1){
            $this->subPageCss1();
        }elseif ($subPage_type == 2){
            $this->subPageCss2();
        }
    }


    /*
        用来给建立分页的数组初始化的函数。
       */
    function initArray(){
        for($i=0;$i<$this->sub_pages;$i++){
            $this->page_array[$i]=$i;
        }
        return $this->page_array;
    }


    /*
        construct_num_Page该函数使用来构造显示的条目
        即使：[1][2][3][4][5][6][7][8][9][10]
       */
    function construct_num_Page(){
        if($this->pageNums < $this->sub_pages){
            $current_array=array();
            for($i=0;$i<$this->pageNums;$i++){
                $current_array[$i]=$i+1;
            }
        }else{
            $current_array=$this->initArray();
            if($this->current_page <= 3){
                for($i=0;$i<count($current_array);$i++){
                    $current_array[$i]=$i+1;
                }
            }elseif ($this->current_page <= $this->pageNums && $this->current_page > $this->pageNums - $this->sub_pages + 1 ){
                for($i=0;$i<count($current_array);$i++){
                    $current_array[$i]=($this->pageNums)-($this->sub_pages)+1+$i;
                }
            }else{
                for($i=0;$i<count($current_array);$i++){
                    $current_array[$i]=$this->current_page-2+$i;
                }
            }
        }

        return $current_array;
    }

    /*
       构造普通模式的分页
       共4523条记录,每页显示10条,当前第1/453页 [首页] [上页] [下页] [尾页]
       */
    function subPageCss1(){
        $subPageCss1Str="";
        $subPageCss1Str.="共".$this->nums."条记录，";
        $subPageCss1Str.="每页显示".$this->each_disNums."条，";
        $subPageCss1Str.="当前第".$this->current_page."/".$this->pageNums."页 ";
        if($this->current_page > 1){
            $firstPageUrl=$this->subPage_link."1";
            $prewPageUrl=$this->subPage_link.($this->current_page-1);
            $subPageCss1Str.="[<a href='$firstPageUrl'>首页</a>] ";
            $subPageCss1Str.="[<a href='$prewPageUrl'>上一页</a>] ";
        }else {
            $subPageCss1Str.="[首页] ";
            $subPageCss1Str.="[上一页] ";
        }

        if($this->current_page < $this->pageNums){
            $lastPageUrl=$this->subPage_link.$this->pageNums;
            $nextPageUrl=$this->subPage_link.($this->current_page+1);
            $subPageCss1Str.=" [<a href='$nextPageUrl'>下一页</a>] ";
            $subPageCss1Str.="[<a href='$lastPageUrl'>尾页</a>] ";
        }else {
            $subPageCss1Str.="[下一页] ";
            $subPageCss1Str.="[尾页] ";
        }

        echo $subPageCss1Str;

    }


    /*
       构造经典模式的分页
       当前第1/453页 [首页] [上页] 1 2 3 4 5 6 7 8 9 10 [下页] [尾页]
       */
    function subPageCss2(){
        $subPageCss2Str="";
        $subPageCss2Str.="第".$this->current_page."/共".$this->pageNums."页 ";
        if($this->current_page > 1){
            $firstPageUrl=$this->subPage_link."1";
            $prewPageUrl=$this->subPage_link.($this->current_page-1);
            $subPageCss2Str.="<a href='javascript:void(0)' class='a1'>首页</a> ";
            $subPageCss2Str.="<a href='javascript:void(0)' class='a1'>上一页</a>";
        }else {
            $subPageCss2Str.="<a href='javascript:void(0)' class='a1'>首页</a> ";
            $subPageCss2Str.="<a href='javascript:void(0)' class='a1'>上一页</a> ";
        }

        $a=$this->construct_num_Page();
        for($i=0;$i<count($a);$i++){
            $s=$a[$i];
            if($s == $this->current_page ){
                $subPageCss2Str.="<a class='num active'>".$s."</a>";
            }else{
                $url=$this->subPage_link.$s;
                $subPageCss2Str.="<a href='javascript:void(0)' class='num'>".$s."</a>";
            }
        }

        if($this->current_page < $this->pageNums){
            $lastPageUrl=$this->subPage_link.$this->pageNums;
            $nextPageUrl=$this->subPage_link.($this->current_page+1);
            $subPageCss2Str.=" <a class='a2' href='javascript:void(0)'>下一页</a> ";
            $subPageCss2Str.="<a class='a2 a3' href='javascript:void(0)'>尾页</a> ";
        }else {
            $subPageCss2Str.="<a href='javascript:void(0)'  class='a2'>下一页 </a>";
            $subPageCss2Str.="<a href='javascript:void(0)'  class='a2'>尾页</a>a> ";
        }
        echo $subPageCss2Str;
    }
}


?>
